Position of the source of daylight high-latitude magnetic pulses in the magnetosphere according to DMSP satellite data

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Daytime high-latitude geophysical phenomena provide a ground-based observer with information about processes at the daytime magnetopause and/or in adjacent magnetospheric domains. It is assumed that these phenomena are initiated by changes in the parameters of the interplanetary medium and therefore can be used as a tool for studying the ways in which solar wind energy penetrates through the magnetopause. Such phenomena include magnetic impulses, which are an isolated train of damped oscillations of 2–3 bursts with a repetition period of 8–12 minutes. Using data from the Scandinavian network of magnetometers IMAGE, eight magnetic impulse events were studied for which DMSP satellites flew over the observation area during, shortly before and immediately after the pulse, crossing the boundaries of several domains. Based on ground-based and satellite data, it has been shown that the downward field-aligned current associated with the impulses is located away from the magnetopause. This means that the impulse cannot be considered as an ionospheric trace of a reconnected magnetic flux tube (flux transfer event, FTE) and/or as a traveling convection vortex (TCV). Using more statistics, it has been established that the pulse is preceded by noticeable changes in the By and Bz components of the IMF, while the contribution to the generation of the impulse from the pressure jump and solar wind speed, as well as the Bx component of the IMF, is not obvious. A possible scenario for the initiation of a magnetic pulse by IMF variations is discussed.

Sobre autores

V. Safargaleev

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, St. Petersburg Department

Autor responsável pela correspondência
Email: Vladimir.safargaleev@pgia.ru
Rússia, St. Petersburg

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